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Polar WearLink+ transmitter Nike+ picks up your heart’s signals and transfers that data into the Nike+ system. The soft textile chest strap seamlessly adapts to your body shape, bringing full freedom of movement to your training. With its hook mechanism, transmitter is just as quick to put on as it is to take off. This new product works with the Nike+ SportBand and the Nike+ iPod Sport Kit, enabling users to run and train with heart rate monitoring for the first time.